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Idlers for Flat Belts-Flanged Type/Crowned Type/Width L6-32 (HBGCS25-21)

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Volume Discount

· Idlers type: Bearing Built-in.
· Shaft Type: one Bearing and Bearing on Each End 2 pcs.
· Type of Idlers: Flanged type and Crowned type.
· The series code of Flanged type: HBG HBGM HBGA HBGS and HBGP.
· The series code of Crowned type: HBGC HBGCM HBGCA and HBGCS.
· Material Idlers body: S45C Equivalent , Aluminum Alloy, Stainless Steel SUS304 and Polyacetal.
· Material of Bearing: Steel and Stainless Steel.
· Outer Diameter: 15 – 50 mm
· Width Thickness: 6 – 32 mm
· Idlers for Stainless Steel Belts- Crowned

(i)Caution

[Specification Change] Internal bearing material will be changed to SUJ2 equivalent starting in July 2025. Please check here for part numbers with specification changes. Products before and after the change may be mixed in the same shipment, but there are no problems with use.
Please check the content on our website as the PDF does not contain the most up-to-date information.

Part Number

Configured Part Number is shown.

HBGCS25-21

Drawing/Specifications
3D Preview
Part Numbers
More Information
Catalog

Flanged
T = 6·11 T = 16·21·27·32 Crowned
T = 11 T = 16·21·27·32

* Bearing Accuracy: JIS B1514 Class 0
[ ! ]The bearings are filled with grease.
[ ! ]Bearings are press-fitted. Use a puller to remove them.
[ ! ]Unless otherwise specified, the dimension tolerance conforms to JIS B 0407 Class m.

Type		[M] Material	[S] Surface Treatment	[M] Material	[A] Accessory
Flanged	Crowned			Bearing (Track Ring / Rolling Element)
HBG	HBGC	S45C Equivalent	Black Oxide	*SUJ2	Retaining Ring (SUS304) (Incorporated)
HBGM	HBGCM		Electroless Nickel Plating
HBGA	HBGCA	2000 Series Aluminum Alloy	Clear Anodize
HBGAS	HBGCAS			SUS440C Equivalent
HBGS	HBGCS	SUS304	—
HBGP	—	Polyacetal	—	*SUJ2

"*SUJ2" equivalent materials are used in some products. Please check here for part numbers subject to specification changes.

Unspecified Dimension
Tolerance

Dimension Range		Tolerance (mm)
Over	Or Less	Tolerance (mm)
0.5	3	±0.1
3	6	±0.1
6	30	±0.2
30	120	±0.3

[ ! ] Compliant with JIS B
0405 m (Medium Class).

d Hole Tolerance

d (mm)		I.D. Tolerance (mm)

Over	Or Less
0.6	2.5	0 －0.008

2.5	10	0 －0.008

10	18	0 －0.008

18	30	0 －0.010

[ ! ] Compliant with JIS B
1514 Class 0.

Specification Table

Part Number	—	T
HBG15 HBGCS50	— —	6 21

Part Number		T	P	dh	ℓ	ℓ₁	L	Bearing
Type	D							No.	d	B
Flanged HBG HBGM HBGA HBGS HBGP HBGAS (Applicable to * only) Crowned HBGC HBGCM HBGCA HBGCS HBGCAS	15	6^*¹	11	9	2	—	8	694ZZ × 1	4	4
	20		16	13	1.5			625ZZ × 1	5	5
	20	11	16	13	4	3	13	625ZZ × 1	5	5
	* 25		19	16	3.5	2.5		626ZZ × 1	6	6
	* 30			17				698ZZ × 1	8
	15	16	11	9	—	—	18	685ZZ × 2	5	5
	20		16	13				625ZZ × 2
	25		19	16				626ZZ × 2	6	6
	* 30			17				698ZZ × 2	8
	35		26 (22)^*²	23 (17)^*²				6000ZZ × 2 (6900ZZ × 2)^*²	10	8 (6)^*²
	* 40
	15	21	11	9	—	—	23	685ZZ × 2	5	5
	20		16	14				688ZZ × 2	8
	25		19	17				698ZZ × 2		6
	* 30							698ZZ × 2
	35		26	23				6000ZZ × 2	10	8
	* 40
	* 50		28	25				6001ZZ × 2	12	8
	15	27	11	9	—	—	29	685ZZ × 2	5	5
	20		16	14				688ZZ × 2	8
	25		19	17				698ZZ × 2		6
	30							698ZZ × 2
	40		26	23				6000ZZ × 2	10	8
	50		28	25				6001ZZ × 2	12
	15	32	11	9	—	—	34	685ZZ × 2	5	5
	20		16	14				688ZZ × 2	8
	25		19	17				698ZZ × 2		6
	30
	40		26	23				6000ZZ × 2	10	8
	50		28	25				6001ZZ × 2	12

[ ! ] HBGP is only applicable to sizes marked with *. [NG]*1 T = 6 is not available for Crowned.
[ ! ]*2 Values in ( ) are Bearing Dimensions when T = 16 and D = 35 or 40 for Crowned.

General Standard for Shaft Fits (Approx.)

Radial Bearing (Class 0, 6X, 6)
Condition		Ball Bearing		Shaft Tolerances
Condition		Shaft Dia. (mm)
Load Characteristics	Load Size, etc.	Over	Or Less
Inner Ring Rotary Load Non-directional Load	Light Load Fluctuating Load	—	18	h5
		18	100	js6
		100	200	k6
	Normal Load	-	18	js5
		18	100	k5
		100	140	m5
Inner Ring Static Load	Inner ring needs to move easily on shaft	Total Shaft Diameter		g6
Inner Ring Static Load	Inner ring does not need to move easily on shaft	Total Shaft Diameter		h6

[ ! ] Compliant with JIS B 1566 (2015) Annex B (Reference).
[ ! ] Load Characteristics
·Inner Ring Rotary Load: The load position on the inner ring changes.
·Inner Ring Static Load: The load position on the inner ring does not change.
·Non-directional Load: Load position is uncertain.

Alterations

Part Number	—	T	—	(FC·KLC·KFC·TC)
HBG15	—	6	—	KFC

Alterations

Flange Cut

One Side Low Flange

One Flange Type

Flange Thickness

Code

KLC

KFC

Spec.

Lowers the flange by cutting.
FC: 0.5 mm Increments

[ ! ] D ≤ FC < D+4
Ordering Code FC30.5

[NG] Not applicable to Crowned.
　

Lowers the flange on one side.

[NG] Not applicable to Crowned.

[NG] Cannot be combined with Alteration KFC.

Cuts off the flange on the right side of the drawing.

[NG] Not applicable to Crowned.

[NG] Cannot be combined with Alteration KLC.

[ ! ] Combine FC and KFC when Flange Cut + One Flange is desired. 　

Machines flange thickness to 0.5mm.
L dimension becomes 1 mm shorter.

[NG] Not applicable to HBGP

[NG] Not applicable to Crowned. 　

[NG] ℓ dimensions are changed in the following models.

Part Number	ℓ dimension (mm)
Part Number	ℓ₂	ℓ₃
HBG15-6 HBG□15-6	1	2
HBG20-6 HBG□20-6	0.4	1.6

App. Example

Product Comparison Information

—	Belt Width (mm)		O.D. (mm)	Standard Type			Stainless Steel Belt	Urethane Lined Type	Economy Type	Shaft Type
				Straight	Crowned	Crosspiece Groove Straight	Crowned	Urethane Lined Type	Economy Type	Shaft Type
				Typical straight configuration. Flanged type can be selected.	Meandering preventing crowned configuration. Flanged type can be selected.	Shape with groove for meandering prevention. Compatible with belt with crosspiece.	Crowned shape for meandering prevention.	Urethane lining is applied (partially press-fit) to prevent slip of the belt and the pulley.	Economical product with thin pipe.	Shaft integrated product. Contributes to reduction of the number of parts.
Pulley	Width Selection	6 to 32	15 to 100	○	○	—	—	○	—	—
	Width Configurable	25 to 100	15 to 80	—	○	○	—	○	—	○
		110 to 510	18 to 80	—	○	○	—	○	○	—
		40 to 160	50 to 100	—	—	—	○	—	—	—
Idler	Width Selection	6 to 32	15 to 50	○	○	—	—	—	—	—
	Width Configurable	25 to 100	15 to 80	○	○	○	—	—	—	—
		110 to 510	18 to 80	○	○	○	—	—	○	—
		40 to 160	50 to 100	—	—	—	○	—	—	—

Cautions/Prohibitions

■ Notes

Bearings are press-fitted. Use a puller to remove them.
The parts and accessories used in this product are not available in single item.
For rust prevention, electroless nickel plating products or SUS304 products are recommend.
T dimension tolerance of belt groove is ±0.2 mm. Check the width tolerance of the flat belt and select the pulley.

Part Number

CAD Data download and 3D preview are not available because the part number has not yet been determined.

*In order to open the CAD Data download and 3D preview screen, the part number must be fixed.
Please confirm the part number from "Specification / Dimension"on the left side, and then perform the CAD Data Download / 3D Preview operation.

CAD Download

: 30; 45; 60

Part Number
HBGCS25-21

Part Number	Standard Unit Price	Minimum order quantity	Volume Discount	Days to Ship	RoHS	Shape	With or w/o Flange	Properties / applications	Outer Dia. D (Ø)	T Selection (mm)	Flange Shape	Material	Shaft Type	Shaft (Bore) Dia. d (mm)	Surface Treatment	Bearing Material	Additional Machining	Material Certificate
	MYR 125.95	1 Piece(s)	Available	7 Day(s)	10	Crowned	No Flange	Corrosion resistance / chemical resistance	40	21	-	SUS304	1-Bearing on Each End (2-Bearing in Total)	8	Not Provided	SUS440C Equivalent	-	-

App. Example

Tensioning Unit with an Idler
　

Product TOP

Basic Information

Environmentally Friendly	RoHS compliant (10 substances)	Length L(mm)	~50	Type	Idlers (Bearing Built-in)
Surface Urethane	Urethane Not Provided	Shaft Hole Specifications	Not Provided

Please check the type/dimensions/specifications of the part HBGCS25-21 in the Idlers for Flat Belts-Flanged Type/Crowned Type/Width L6-32 series.

Configure

1 Part Numbers

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Configure Remaining Specifications

Completed

Specification/Dimensions

Flange Shape
- Standard
Clear
Additional Machining
- No
- Provided
Clear
type
- HBG
- HBGA
- HBGC
- HBGCA
- HBGCM
- HBGCS
- HBGM
- HBGP
- HBGS
Clear
Shape
- Straight
- Crowned
Clear
With or w/o Flange
- Flange
- No Flange
Clear
Properties / applications
Low Dust Generation

Corrosion resistance / chemical resistance

Insulation Property
Clear
Outer Dia. D(Ø)
15

20

25

30

35

40

50
Clear
T Selection(mm)
6

11

16

21

27

32
Clear
Material
- Steel
  - S45C Equivalent
- Aluminum
  - 2000 Series Aluminum Alloy
- SUS304
- Polyacetal
Clear
Shaft Type
- 1-Bearing
- 1-Bearing on Each End (2-Bearing in Total)
Clear
Shaft (Bore) Dia. d(mm)
4

5

6

8

10

12
Clear
Surface Treatment
- Not Provided
- Black Oxide
- Electroless Nickel Plating
- Clear Anodize
Clear
Bearing Material
- SUJ2
- SUJ2 Equiv.
- SUS440C Equivalent
Clear
CAD
- 2D
- 3D
Clear

Days to Ship

All

1 Day(s) or Less

2 Day(s) or Less

4 Day(s) or Less

5 Day(s) or Less

6 Day(s) or Less

7 Day(s) or Less
Clear

Specify Alterations

The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .

Products like this...

Part Number
HBGC15-32
HBGC20-11
HBGC20-16
HBGCS25-27
HBGCS25-32
HBGCS30-11

Standard Unit Price	Minimum order quantity	Volume Discount	Days to Ship	RoHS	Shape	With or w/o Flange	Properties / applications	Outer Dia. D (Ø)	T Selection (mm)	Flange Shape	Material	Shaft Type	Shaft (Bore) Dia. d (mm)	Surface Treatment	Bearing Material	Additional Machining	Material Certificate
MYR 93.35	1 Piece(s)	Available	7 Day(s)	10	Crowned	No Flange	-	15	32	-	[Steel] S45C Equivalent	1-Bearing on Each End (2-Bearing in Total)	5	Black Oxide	SUJ2 Equiv.	-	-
MYR 50.91	1 Piece(s)	Available	7 Day(s)	10	Crowned	No Flange	-	50	16	-	[Steel] S45C Equivalent	1-Bearing	5	Black Oxide	SUJ2	No	-
MYR 66.85	1 Piece(s)	Available	7 Day(s)	10	Crowned	No Flange	-	50	6	-	[Steel] S45C Equivalent	1-Bearing on Each End (2-Bearing in Total)	5	Black Oxide	SUJ2	-	-
MYR 147.95	1 Piece(s)	Available	7 Day(s)	10	Crowned	No Flange	Corrosion resistance / chemical resistance	40	27	-	SUS304	1-Bearing on Each End (2-Bearing in Total)	8	Not Provided	SUS440C Equivalent	-	-
MYR 155.10	1 Piece(s)	Available	7 Day(s)	10	Crowned	No Flange	Corrosion resistance / chemical resistance	40	32	-	SUS304	1-Bearing on Each End (2-Bearing in Total)	8	Not Provided	SUS440C Equivalent	-	-
MYR 89.43	1 Piece(s)	Available	7 Day(s)	10	Crowned	No Flange	Corrosion resistance / chemical resistance	20	16	-	SUS304	1-Bearing	8	Not Provided	SUS440C Equivalent	-	-

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Idlers for Flat Belts-Flanged Type/Crowned Type/Width L6-32 (HBGCS25-21)

(i)Caution

Specification Table

Alterations

App. Example

Product Comparison Information

Cautions/Prohibitions

Part Number

App. Example

Basic Information

Configure

Specification/Dimensions

Flange Shape

Additional Machining

type

Shape

With or w/o Flange

Properties / applications

Outer Dia. D(Ø)

T Selection(mm)

Material

Shaft Type

Shaft (Bore) Dia. d(mm)

Surface Treatment

Bearing Material

CAD

Days to Ship

Specify Alterations

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